/* CountryLookup.cs
 *
 * Copyright (C) 2002 MaxMind.com.  All Rights Reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

using System;
using System.IO;
using System.Data;
using System.Net;


namespace Citiport.Util.IPGeo
{
	/// <summary>
	/// Summary description for CountryLookup.
	/// </summary>
	public class CountryLookup
	{
		private FileStream fileInput;
		private static long COUNTRY_BEGIN = 16776960;
		private static string[] countryCode = 
								{ "--","AP","EU","AD","AE","AF","AG","AI","AL","AM","AN","AO","AQ","AR","AS","AT","AU","AW","AZ","BA","BB","BD","BE","BF","BG","BH","BI","BJ","BM","BN","BO","BR","BS","BT","BV","BW","BY","BZ","CA","CC","CD","CF","CG","CH","CI","CK","CL","CM","CN","CO","CR","CU","CV","CX","CY","CZ","DE","DJ","DK","DM","DO","DZ",
									"EC","EE","EG","EH","ER","ES","ET","FI","FJ","FK","FM","FO","FR","FX","GA","GB","GD","GE","GF","GH","GI","GL","GM","GN","GP","GQ","GR","GS","GT","GU","GW","GY","HK","HM","HN","HR","HT","HU","ID","IE","IL","IN","IO","IQ","IR","IS","IT","JM","JO","JP","KE","KG","KH","KI","KM","KN","KP","KR","KW","KY","KZ",
									"LA","LB","LC","LI","LK","LR","LS","LT","LU","LV","LY","MA","MC","MD","MG","MH","MK","ML","MM","MN","MO","MP","MQ","MR","MS","MT","MU","MV","MW","MX","MY","MZ","NA","NC","NE","NF","NG","NI","NL","NO","NP","NR","NU","NZ","OM","PA","PE","PF","PG","PH","PK","PL","PM","PN","PR","PS","PT","PW","PY","QA",
									"RE","RO","RU","RW","SA","SB","SC","SD","SE","SG","SH","SI","SJ","SK","SL","SM","SN","SO","SR","ST","SV","SY","SZ","TC","TD","TF","TG","TH","TJ","TK","TM","TN","TO","TP","TR","TT","TV","TW","TZ","UA","UG","UM","US","UY","UZ","VA","VC","VE","VG","VI","VN","VU","WF","WS","YE","YT","CS","ZA","ZM","ZR","ZW","A1","A2"};
		private static string[] countryName = 
								{"N/A","Asia/Pacific Region","Europe","Andorra","United Arab Emirates","Afghanistan","Antigua and Barbuda","Anguilla","Albania","Armenia","Netherlands Antilles","Angola","Antarctica","Argentina","American Samoa","Austria","Australia","Aruba","Azerbaijan","Bosnia and Herzegovina","Barbados","Bangladesh","Belgium",
									"Burkina Faso","Bulgaria","Bahrain","Burundi","Benin","Bermuda","Brunei Darussalam","Bolivia","Brazil","Bahamas","Bhutan","Bouvet Island","Botswana","Belarus","Belize","Canada","Cocos (Keeling) Islands","Congo, The Democratic Republic of the","Central African Republic","Congo","Switzerland","Cote D'Ivoire",
									"Cook Islands","Chile","Cameroon","China","Colombia","Costa Rica","Cuba","Cape Verde","Christmas Island","Cyprus","Czech Republic","Germany","Djibouti","Denmark","Dominica","Dominican Republic","Algeria","Ecuador","Estonia","Egypt","Western Sahara","Eritrea","Spain","Ethiopia","Finland","Fiji","Falkland Islands (Malvinas)",
									"Micronesia, Federated States of","Faroe Islands","France","France, Metropolitan","Gabon","United Kingdom","Grenada","Georgia","French Guiana","Ghana","Gibraltar","Greenland","Gambia","Guinea","Guadeloupe","Equatorial Guinea","Greece","South Georgia and the South Sandwich Islands","Guatemala","Guam","Guinea-Bissau","Guyana",
									"Hong Kong","Heard Island and McDonald Islands","Honduras","Croatia","Haiti","Hungary","Indonesia","Ireland","Israel","India","British Indian Ocean Territory","Iraq","Iran, Islamic Republic of","Iceland","Italy","Jamaica","Jordan","Japan","Kenya","Kyrgyzstan","Cambodia","Kiribati","Comoros","Saint Kitts and Nevis",
									"Korea, Democratic People's Republic of","Korea, Republic of","Kuwait","Cayman Islands","Kazakstan","Lao People's Democratic Republic","Lebanon","Saint Lucia","Liechtenstein","Sri Lanka","Liberia","Lesotho","Lithuania","Luxembourg","Latvia","Libyan Arab Jamahiriya","Morocco","Monaco","Moldova, Republic of","Madagascar",
									"Marshall Islands","Macedonia","Mali","Myanmar","Mongolia","Macau","Northern Mariana Islands","Martinique","Mauritania","Montserrat","Malta","Mauritius","Maldives","Malawi","Mexico","Malaysia","Mozambique","Namibia","New Caledonia","Niger","Norfolk Island","Nigeria","Nicaragua","Netherlands",
									"Norway","Nepal","Nauru","Niue","New Zealand","Oman","Panama","Peru","French Polynesia","Papua New Guinea","Philippines","Pakistan","Poland","Saint Pierre and Miquelon","Pitcairn Islands","Puerto Rico","Palestinian Territory","Portugal","Palau","Paraguay","Qatar","Reunion","Romania","Russian Federation","Rwanda","Saudi Arabia",
									"Solomon Islands","Seychelles","Sudan","Sweden","Singapore","Saint Helena","Slovenia","Svalbard and Jan Mayen","Slovakia","Sierra Leone","San Marino","Senegal","Somalia","Suriname","Sao Tome and Principe","El Salvador","Syrian Arab Republic","Swaziland","Turks and Caicos Islands","Chad","French Southern Territories","Togo",
									"Thailand","Tajikistan","Tokelau","Turkmenistan","Tunisia","Tonga","East Timor","Turkey","Trinidad and Tobago","Tuvalu","Taiwan","Tanzania, United Republic of","Ukraine","Uganda","United States Minor Outlying Islands","United States","Uruguay","Uzbekistan","Holy See (Vatican City State)","Saint Vincent and the Grenadines",
									"Venezuela","Virgin Islands, British","Virgin Islands, U.S.","Vietnam","Vanuatu","Wallis and Futuna","Samoa","Yemen","Mayotte","Serbia and Montenegro","South Africa","Zambia","Zaire","Zimbabwe","Anonymous Proxy","Satellite Provider"};
		
		
		public CountryLookup(string fileName)
		{
			try
			{
				fileInput = new FileStream(fileName, FileMode.Open, FileAccess.Read);
			}
			catch (FileNotFoundException e)
			{
				//Console.WriteLine("File " + fileName + " not found.");
			}
		}

		public string lookupCountryCode(string str) 
		{
			IPAddress addr;
			try 
			{
				addr = IPAddress.Parse(str);
			}
			catch (FormatException e) 
			{
				return "--";
			}
			return lookupCountryCode(addr);
		}

		private long addrToNum(IPAddress addr) 
		{
			long ipnum = 0;
			byte[] b = BitConverter.GetBytes(addr.Address);
			for (int i = 0; i < 4; ++i) 
			{
				long y = b[i];
				if (y < 0) 
				{
					y+= 256;
				}
				ipnum += y << ((3-i)*8);
			}
			//Console.WriteLine(ipnum);
			return ipnum;
		}

		public string lookupCountryCode(IPAddress addr) 
		{
			return(countryCode[(int)seekCountry(0, addrToNum(addr), 31)]);
		}

		public string lookupCountryName(string str) 
		{
			IPAddress addr;
			try 
			{
				addr = IPAddress.Parse(str);
			}
			catch (FormatException e) 
			{
				return "N/A";
			}
			return lookupCountryName(addr);
		}

		public string lookupCountryName(IPAddress addr) 
		{
			return(countryName[(int)seekCountry(0, addrToNum(addr), 31)]);
		}

		private long seekCountry(long offset, long ipnum, int depth) 
		{
			byte [] buf = new byte[6];
			long [] x = new long[2];
			if (depth == 0) 
			{
				//Console.WriteLine("Error seeking country.");
			}
			try 
			{
				fileInput.Seek(6 * offset, 0);
				fileInput.Read(buf, 0, 6);
			}
			catch (IOException e) 
			{
				//Console.WriteLine("IO Exception");
			}
			for (int i = 0; i<2; i++) 
			{
				x[i] = 0;
				for (int j = 0; j<3; j++) 
				{
					int y = buf[i*3+j];
					if (y < 0) 
					{
						y+= 256;
					}
					x[i] += (y << (j * 8));
				}
			}

			if ((ipnum & (1 << depth)) > 0) 
			{
				if (x[1] >= COUNTRY_BEGIN) 
				{
					return x[1] - COUNTRY_BEGIN;
				}
				return seekCountry(x[1], ipnum, depth-1);
			} 
			else 
			{
				if (x[0] >= COUNTRY_BEGIN) 
				{
					return x[0] - COUNTRY_BEGIN;
				}
				return seekCountry(x[0], ipnum, depth-1);
			}
		}
	}
}
